Mode defines the construction type of parallels applied to the free edges of shape S; currently, only one construction type is implemented, namely the one where the free edges do not generate parallels; this corresponds to the default value BRepOffset_Skin;

Intersection specifies how the algorithm must work in order to limit the parallels to two adjacent shapes:

if Intersection is false (default value), the intersection is calculated with the parallels to the two adjacent shapes,

if Intersection is true, the intersection is calculated by taking all generated parallels into account; this computation method is more general as it avoids some self-intersections generated in the offset shape from features of small dimensions on shape S, however this method has not been completely implemented and therefore is not recommended for use;

SelfInter tells the algorithm whether a computation to eliminate self-intersections must be applied to the resulting shape; however, as this functionality is not yet implemented, it is recommended to use the default value (false);

Join defines how to fill the holes that may appear between parallels to the two adjacent faces. It may take values GeomAbs_Arc or GeomAbs_Intersection:

if Join is equal to GeomAbs_Arc, then pipes are generated between two free edges of two adjacent parallels, and spheres are generated on "images" of vertices; it is the default value,

if Join is equal to GeomAbs_Intersection, then the parallels to the two adjacent faces are enlarged and intersected, so that there are no free edges on parallels to faces. RemoveIntEdges flag defines whether to remove the INTERNAL edges from the result or not. Warnings

All the faces of the shape S should be based on the surfaces with continuity at least C1.

The offset value should be sufficiently small to avoid self-intersections in resulting shape. Otherwise these self-intersections may appear inside an offset face if its initial surface is not plane or sphere or cylinder, also some non-adjacent offset faces may intersect each other. Also, some offset surfaces may "turn inside out".

The algorithm may fail if the shape S contains vertices where more than 3 edges converge.

Since 3d-offset algorithm involves intersection of surfaces, it is under limitations of surface intersection algorithm.

A result cannot be generated if the underlying geometry of S is BSpline with continuity C0. Exceptions Geom_UndefinedDerivative if the underlying geometry of S is BSpline with continuity C0.